Seongil Lee Hyunseung Choo Sungdo Ha In Chul Shin Computer-Human Interaction, 8th Asia-Pacific Conference, APCHI 2008, Seoul, Korea, July 6-9, 2008, Proceedings 5068 2008 978-3-540-70584-0 Lecture Notes in Computer Science Springer APCHI db/conf/apchi/apchi2008.html